SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be30d1779dab6889cdc3a0a707173cd10a757ac87297f152dff7fd8263eda45c' 
  AND token = '/Gt/bgTab9aR0kyCIQx0BqYW0SMaK3ibC62RSt9uTzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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