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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caab72bf51b532948cd129cdc1c3dc3dccb19c795406ff59c305fdfe4a22f837' 
  AND token = '0K2Yg/noDlAixmnPSLPTvFQsskFlrtA5Srwov6O0TP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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