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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30b9bdb03ef78763fd2c4373e986907674c87d8936c8f6c361ce73cd5e760081' 
  AND token = 'HwsIrd8MvWVdO0Ieunao7LHeJ9lDtRMTNfcWgdaeJ9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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