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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f137d4eb9583a4745a8131bbe8404a6344c49eec39b03fadb6ec960649762cc9' 
  AND token = 'aiQ6EMQ32Mh0SgItq2vdflj5n70sb6vi+27/FNENqdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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