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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1debb18eee2da7873265c876e1fc240e683866cd65432c7d7bf364f301d26c3a' 
  AND token = '4LgMnP0BfIBwl0b3NpE4cUpzLJXIVajue1XtXv2y8oc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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