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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b26429c5bc46d7989157356ae1d70c1a1b007c19625e45f90059cf2a60be3a8d' 
  AND token = 'sKG4Wx2ybq0ylU6pfwj4ez8CalVOir3NRWeONFwYhyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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