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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10546c14d776c68d15618553da733b84008605846ff8f5e8b28c5ef53db2a74b' 
  AND token = 'o45abYH4VbHEL8LTaFwp1Irj0syC2aQgFdCk5UEnSsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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