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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e812700493cfd20285206846de5b9e11bb4f287a658c696b44ee2ae96d8986d' 
  AND token = 'HbOL+NnY36dzuRIb6iUBKH2aqou1oN7yvKowvnrB/fQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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