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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a60fdfcb48747853ed87848502b10d155129f1b47c81818e7f34791a9f2293c' 
  AND token = 'j4qy1TlhHUqqV1kXK2zz/xiZ+8IMaly7j0V1Lpdy+kc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}