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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf7b3602c5dd7e7686842857e3a3ac86ec109d724e4e24206c10bcb9b3832cb0' 
  AND token = '6D5FRFcx4s3rOR2BA7pvavVyLjq8cNJrOu/qhTElUpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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