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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ae6984d23141da373bd2bfc67465d4982f054a1c5baabe3d3709ab2432b0399' 
  AND token = 'lCAz59OUEzbel/KhQCySuu2xKl4EIBd/QvpvOgOQukg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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