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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ad5b2166f69c2de47e1044c1e7c4eb8a7ad3d8fbb30a0e8fad1357e931b2fea' 
  AND token = 'DlH4SWoOqzxxGDaJcavqUIHp0qtBRoWX5fIZheK80Vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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