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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a918e90080bc5a54b4ba2d5141a18e0d821b1280913b187c80f1b2748c698f9b' 
  AND token = 'iWgfHud+PVb71N2qZXxhrpjXDZsIzP4ah5GhP8ub+j8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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