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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '788b811a2fc8a294e31062c8039a0475f0ce5a8a3b84a7fcc07e29a05b8ac2f9' 
  AND token = 'UG8b5+BjQcNbEcgYxE31N2zmbp4QyOsJ7fs5U9OsQ8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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