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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e82787a5fd51e4cd6a2e1fbdbd0ca6a206e934c448b27526b2185f95b036bb1' 
  AND token = 'kAkoZtVe8MSlrqqDTa7xfuiIxiV6pEEG1kw3ggD4LGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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