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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd2446fcfff234c573a6edf6a8a98af0517ac5e1e12ff597b4883a7af4258cd7' 
  AND token = 'q0TW3rDAAyFa6znSWNQNQ4aMURSoLHSjrCqEYsjALFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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