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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9820e419381e779505c133a5927e83a6b4708451c12d874dd6090c2a2e14efa4' 
  AND token = '+L4urAbQIqMZExWAN4P3RYe+EkHXZj5Q3HuGyLioNXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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