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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '997588c7f80c7a85a18123772d4a23869b5d2fdf5e2a347c4ae66e2dbbd9fcb0' 
  AND token = '93YL+7c6unXUiH9JbLSq+rFb1/mW3x0I/GxZNderxtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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