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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0f1f2dc5368a16e70bd161f819b791fa5736864fbf009eff0e68409da87bc54' 
  AND token = 'xCfLgnFgnDt9KHnlXdiroUZ5DfYHV8XR5B9VsvJIEK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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