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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62bd07d843eb1969787a178010b96546bcf54fca46cd961604c1f49b8c53a4f2' 
  AND token = '8DuPzetawYkaOpBA5FmEk9KAjerrtVH1l4kiGp8T1rk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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