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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2ed15ab2eba1b74c9361962019859d57d749c8a35a7184850fbfb4a9989ffb7' 
  AND token = 'q+SPDlDFAwmCkUiDNpoHomU93g4kugdxdpfO+O2UA+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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