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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f4237aa89de68f1574a7e48020f0ac0d3139539a1b2a1d7e1d8a4bb07ca07aa' 
  AND token = 'Ocn+14+kZAtEZdbah5K5596APzzszU5DSkuC6pLLhlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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