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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89da61d1dd5c05adde1cdd64972b9c403a533c4fba3e5dc443f56cf1e7267e00' 
  AND token = '3/FvSSsBsdJVV+6Na/nQUbzXZ9mdoQB3uZ9zCIJFBEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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