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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6f047304582af24db191a8523c4866da9b13ab23cd3108a5e3da3d6bb8e295a' 
  AND token = 'gv0OsxlvHKGW9TEHOmCWR7b23MausMbdHkjHI2gLt5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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