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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcee93d684074ffb4067fabc52ff8ba805c63d04338342be1101e4b2bfce8489' 
  AND token = 'SOvoPCJ+zwWGmWFFG1KnVI1hc6wwNXvVkhEtb3OST/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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