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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2817be881a70be88fa5ddcc210b0b1c4a89af0042c1928fbcc6a616c9ad1866' 
  AND token = '5pnLmn9ZylNG15BXRRzrqCbr/o0A7tOKXl7aha4Grk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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