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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6ac1c5f7700f84892e396ade6df7aae5ac7469b322114ca8ff6ed630ca917d8' 
  AND token = '9dP6aa2UoQGJ5xZ4wYN2U1qXSpe/KR6hjyNPek7kTww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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