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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ff96db70c6551eda25064a68392d9fe533368e5acefd02fd92ebfcf82093ae7' 
  AND token = '1dQ3srO5MczNvYfyNMuGNHTNy5T+XmkdNvfYd+h86i8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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