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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85ab38cf9abea52319a6bc170a384560309312bfab45f415e5779552963ecd77' 
  AND token = 'xo5zoJrFo5kOUlVCA6qzVZH4oSpf0skszgfkkpG6k14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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