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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c85f8680e89aef812f51a8a49ae84352257ab128a95436e2bddf0bd29be58c7c' 
  AND token = 'PFvEpCVi4+QzENn8cgB8Jdbyxsu/ujz+5K4tp8tEpow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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