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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7779f6b56b8d71cbb2a486a85b3daedbd0235c6c5dcf82bb3f8f43a4646ca685' 
  AND token = '8eDKveNjDMGhUhsvQ3z8usoi4oe8/O7Y5TVvSdbFAgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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