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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '438bd686870c9efd872647318d30790e2329f3e6cbcb1b7374d7900960bad758' 
  AND token = '3mdnV8+Z3bpYnCR0FNPgxbt6VoPphGsN40GdoAlOKTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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