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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59cf4d651cca51f065a4388a24e60b355e9d23d35f3de524aa50de597aebb12c' 
  AND token = 'Jsv37a8e77IUtlu3HIb1Y/vsvU5VbKZta/vX5eqjBQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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