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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c936ead195b4a513d8fe2471adfbc433a36456b870922958bb11505eb5bc6be' 
  AND token = 'IL9V3720Ho1HAYmzoMi0qVCe0N7D4afzgNDcUa0b/ZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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