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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '674f8ddfad803f8c180effbfd37c0fec09dbcc1c67951f5147f1431517d4c078' 
  AND token = 'K6rh+oZkU2Y7kSpjfva9A2WhFJ7D1UOGEjT1kjeI4E8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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