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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b904aa652c8fc947eafff362acea5b888ec31bb9a1e07bfcb916277dcb1d0648' 
  AND token = '+MxdT1gHLhFraFVOcR9vzgfDTCkn84lTD0bjFartTo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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