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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2e260ae333748e09a29feb99d7b9b42d26abbf0445d6113cf61f52b24edf743' 
  AND token = 'Je3pRSMw5AxBtjKMOvJf8vkbqzAR43msdX4xS2CqXp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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