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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04831c35d32ddba4a65559ba781a7e292e6044b513becdad788d6a6e93211d25' 
  AND token = 'sgx4GV/peD/NMAqllErfz/4ACVW6lWj20DUqvt8rvgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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