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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '261e3be1df441b0f8a259855071843e68207b98d329a6b0cd8048744fc0c2a86' 
  AND token = 'uzQLTgN7o8QEYcSZx0K0X+eWcg2PbQqASqGOdnYgu/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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