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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fe6cf2ff88657e7e38703b60afcfc22f9d77bbd4f7e192123a0a632b5c8adee' 
  AND token = '7sWk5W0MFvhqOfAFJP8r5ka0RGRqV8shayKXRwi4E7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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