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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70e2a3e03ebb3a51e8d4d4e3d79b2998f3b28095900e60492f6fb050ee318283' 
  AND token = 'e0dXPp6aVa4qcwsLzuDlpE4Ss48VRQObdegcakTzyyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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