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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9843801b8a2559145c5b04706bac7f9f88a4155b761057e724043881c7f6ee80' 
  AND token = 'IgMsQ8bz7emUT0nO54ZY9O9sziWtYxtkkr95UW7WrT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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