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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce07962b82b2719004e7716f34e01c907c8fdd3bec33ad7afbf9a49a07e984e6' 
  AND token = 'qiUjkBe9g6vz0tTUEckVzJWyTw6W6zUu73QG6QfBVbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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