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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '571c2f19d561867e0b4bd93db299b45a0906231cbe8c29ce59e9c0b24f81b8fb' 
  AND token = '0SvvgtDDk+HIVFNtdkfMNbVscLI9sFZS9r8+NXLcL5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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