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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25e2e48ecf79d298bd2f1af9c4c30d444daa7695032b17abe7fb26ab02ccbac3' 
  AND token = '9TlK6sWVVRvcWX/Z949MShlf3MYnJ3yKGFHAQnd46Rs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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