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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaa81f9988eb4711e1518ad8e557476e9fd8ea9fe3f87f116e6ea75a257ac5fe' 
  AND token = '3rjaO54T8DJ2jn6pprVohIB+w/JxGFn0QQdVgxHCdEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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