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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34733442c425632ec06162576bfd6ace895839b22e00f7ebc3b3d1f3ba4174d1' 
  AND token = 'aAWn7GahDbpZT/tjLY5XZUBQjV6LSnDZsN6DFi0L/E8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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