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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b968da931ee25954fa11a40eb3916ef65e3aa98ae5eb71298e445d49acf39cd2' 
  AND token = 'eAqNVcaUEmbRr7fZqwWdQW8K42/DgDiYf5RcjX+Co/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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