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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad0a3eb89c4b646630f5ffb263a6759c2a9e747ce5343635cae56f62d842f0d2' 
  AND token = 'i8vMY8IAMfExLz1RQQo87RXmWonX5yxetSKgnPjGr74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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