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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c927538fa4242d196ea2701a2815c4e9a85509f21b097b7cd6f8da70b2ab442e' 
  AND token = 'Ylwv5/tB5btJzmDwZemEj0MTsuwoP/JsB8H8yub684A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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