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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54cfb8bc5df3b6c0fb9b0e9031857423cc5e2251e9abf4fa4be7d768321a0b7d' 
  AND token = 'BXQ0lcMQDWb7AA1xEkRn71jJgb90Qo/r56BEHkbLSxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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