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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '172029bc663cd2fcd592dcb5de7bb18436ca96ed4284386c644a401c818cd9d6' 
  AND token = '6SihgV2QUqy6U/CUM5TSL1yShgA//6z3gEfDrUpItfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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