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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03313c2a83828197a83c002a7ef3eca50dfa3dc406f190809974c6f987898dc3' 
  AND token = 'trSf4/9iUQa6kH3ZOOV37xpPCgpzTgMSEw6X/atx2Pg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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