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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41f81c65d28b1571c83ae30c6ea4e79d035b8a2173fcdf149597ccb2452be5e2' 
  AND token = 'AS6Zua5oOaMBfdIxSpAUI0ZmhDhlEp2j78nE0Ps/q/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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