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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '364f9d1937f10682d131f13908d1d22b876ddc45faf0dbe31183918d5eea9696' 
  AND token = '3UdZ5ZER4w66GAmKvTTZYa3i1DKykfClhxYmMEc9Y5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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