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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe7218c70079fc933df061354e3d9abdf189ac17796d7ae0deb7676d570e630c' 
  AND token = 'MkvFgatmq3O3tImW2ZYU85NsQJh4f09F5eA9VAqdfZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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