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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd60f9e6a2dbd98301023966d9f4f57845c5771c747846af2708404063e0b649e' 
  AND token = 'oSSRm4zHywk34l1ekmz9t1+TJ4OoAsmQwQSKIk3HCxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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